What is the ruling on preparing student reports for a fee if the teacher knows that the students either have others do them or download them from the internet?

It is not permissible to write reports and research papers for students, whether for a fee or for free, because it involves cheating and corrupts the youth. Rather, students themselves must undertake these tasks to train them in research. There is no harm in benefiting from other research papers, the internet, and seeking assistance from colleagues on some specific points. However, taking a complete research paper from someone else is cheating and falsehood.